Details

Autor(en) / Beteiligte

• MARCINKO, J. J
• RINALDI, P. L
• BAO, S

Titel

Exploring the physicochemical nature of PMDI/wood structural composite adhesion

Ist Teil von

• Forest products journal, 1999-05, Vol.49 (5), p.75-78

Ort / Verlag

Madison, WI: Forest Products Society

Erscheinungsjahr

1999

Quelle

Business Source Ultimate

Beschreibungen/Notizen

• The development of structure/property relationships for wood composites bonded with polymeric diphenylmethane diisocyanate (PMDI) can be achieved by observing the changes in molecular motions and molecular ordering of the wood molecules, which are the two characteristics that define a material's viscoelastic behavior. These characteristics are easily observed using solid state nuclear magnetic resonance spectroscopy relaxation measurements. In a wood composite, if the number of molecular associations between adhesive molecules and wood molecules is large enough, one should expect to observe changes in at least some of the distributions of molecular mobility or changes in molecular arrangements when comparing the composite to whole wood. The investigations applied inversion recovery cross polarization measurements to probe the near static motional regimes of aspen wood (Populus tremula) molecules in the presence and absence of PMDI adhesive.